742 THE AMERICAN NATURALIST. [VOL. XXXIX. 



minutely, extremely densely punctate all over, therefore rough and not 

 shining ...... Entechnia toluca (Cresson). 



Larger ; at least over 8 mm. long ; mesothorax well punctured but shin- 

 ing . 3. 



3. Large and stout ; about 12 mm. long, or more 



D. bituberculata (Cresson). 

 Smaller ; about 10 mm. long, or less . . . afflicta (Cresson). 



4. Very large species, about 15 mm. long . megamorpha Cockerell. 

 Large stout species, about 13 mm. long ; hair of thorax above pchraceous 

 or fulvous, with the disc bare ... . . . . . 5. 



Smaller species, less than 12 mm. long . . . . . . 7. 



5. Hind spur of hind tibia straight or practically so ; clypeus more closely 

 punctured, the large punctures stronger . . enavata (Cresson). 

 Hind spur of hind tibia strongly bent at end ; clypeus less closely punc- 

 tured, the large punctures weaker .... . . . 6. 



6. Legs dark red ; abdominal segments 3 and 4 with a narrow apical 

 fringe, the rest thinly hairy .... australis (Cresson). 

 Legs black ; abdominal segments 3 and 4 with lateral areas where the sur- 

 face is raised and shining black, the hair on it being very sparse and 

 dark . . . . . . australis opuntia (Cockerell). 



7. Anterior edge of abdominal bands curved, the basal part of the seg- 

 ments dark ; comparatively large and broad form : hind spur of hind 

 legs curved at end .... australis rinconis (Cockerell). 

 Anterior edge of abdominal bands not curved, the pubescence, except at 

 margin, uniformly distributed ; smaller forms .... 8. 



8. Hair on inner side of basal joint of hind tarsi light ferruginous ; abdo- 

 men entirely covered with yellowish tomentum Dasiapis ochracea Ckll. 

 Hair on inner side of basal joint of hind tarsi fuscous or black . 9. 



9. Face broad, eyes scarcely converging below ; eyes narrow, especially 

 above ; mesothorax shining, impunctate in middle, at sides with large 

 -scattered punctures ; abdomen broad, with narrow ochreous hair-bands 

 on hind margins of segments 2 to 4 ... laticauda Cockerell. 

 Eyes broader and shorter, distinctly converging below ; mesothorax dul- 

 ler, the sides with very numerous feeble minute punctures 



diniinuta (Cresson). 



Larger than the two last (i I mm. long) and at once separated from them by 

 having much fuscous or black hair on the abdomen ; there are ochreous 

 marginal hair-bands . ... . friesei Cockerell. 



MALES. 



Hair of face black -nigrifrons (Cresson). 



Hair of face not black ......... i. 



I. Apex of abdomen truncate; tongue very long; maxillary palpi not 

 fringed with hair ; size very small . . Entechnia toluca (Cresson). 



